@abgemacht: I've been through college, and I disagree with you. "Breaking the relationship before in a healthy manner, imho, shows maturity and wisdom" -- No, breaking a successful relationship just because you're entering a new phase of life shows a lack of faith in the relationship. What shows maturity and wisdom is to have an open and frank discussion about the transition and how each of you feel about it. There's absolutely nothing wrong with heading into the transition with eyes wide open, both of you striving to achieve your mutual goal of making it work. The vast odds are that it will not work out, and both of you should recognize that. That doesn't mean you should automatically call it off, because on rare occasions it does work out.
Every relationship, every life decision involves a road not taken. This is just one more fork in the road. You can start dating someone when you're in college, then one of you has to decide about a year studying abroad. Or where to go to grad school. Or where to take a first job. There are always going to be new situations, new temptations, new opportunities. Most relationships fail no matter when you start them. Every successful relationship started somewhere.